Governor



/fz i INVENTOR.

GOVERNOR NN v S. M. UDALE April 6, 1943.,

Filed July 13, 1942 Patented Apr. 6, 1943 GOVERNOR Stanley M. Udale, Detroit, `Mich., assigner to George M. Holley and Earl Holley Application July 13, 1942, Serial No. 450,824

1 Claim.

The object of this invention is to control the speed of an internal combustion engine.

The gure tion.

In the figure, I is the venturi of an ordinary plain tube carburetor, into the throat of which a nozzle II discharges. The nozzle II is supplied with fuel from a constant level chamber I2. 'I'he depression in the throat of the venturi III is transmitted through a passage 33 to a chamber I3 located on the right hand side of a diaphragm I4. A spring I5 engages with the diaphragm I4 and pushes a rod I6 to the left, causing the throttle lever I'I to rotate counterclockwise. The throttle I8 thus I:rotates counterclockwise, carrying with it the cam I9 which engages with the roller 20. The roller 20 is located on the left hand side of the lever 2| which is connected to a shaft 22, which carries the lever 23. The lever 23 engages with the spring support 24 which compresses the spring 25 which seats the valve 26 and closes a passage 21. A passage 28 communicates with an opening 29 located opposite the lip of the throttle I8 when the throttle I8 is in the closed position,

'Ihe diaphragm 38 is exposed on its upper face to the atmospheric'pressure and is connected to the valve 26 and is engaged by the spring 25. The chamber 3| being the chamber below the diaphragm 30, communicates through a restricted opening 32'1with the mixture outlet on the engine side of the throttle I8. The passage 2l communicates with the passage 33 and also with the passage 34 which communicates with a restriction 35 in the throat of the venturi I Il.

The throttle lever 36 connected to the throttle control rod 3l engages with a pin 88 on the end of the rod I6 so that when the throttle lever 3S is manually pushed to the right the lever 36 engages with the pin 38 and positively closes the throttle I 8.

When the lever 36 moves to the left, it merely permits the throttle to open. From then on the throttle I8 is under the control of the governor. Assuming that the throttle I8 is wide open, the engine increases in speed until the depression in the throat of the venturi I0 is sulciently great shows diagrammatically my invento overcome the pressure of the spring I5 when the rod I6 moves to the right and the pin 38 engages with the lever I'I, and thus closes the throttle.

As the throttle I8 closes a suction is built up bothin the passage 28 and in the chamber 3|, and as the suction increases the diaphragm is deected downwardly, the valve 26 moves downwardly, and the suction is admitted from the passage 28 to the passage 2l and thus to the back side of the diaphragm I4 through the passage 33. At every position of the throttle I8, there is a deilnite compression of the spring 25, at which the valve 26 unseats. In other words, there is a definite suction in the mixture outlet corresponding to every position of the throttle I8. This relationship is determined by the contour of i the cam I9 so that as the throttle closes the speed drops, being controlled by the cam contour I9. The function of the restriction 32 is to prevent hunting. For a similar purpose a small opening 39 will prevent the diaphragm I4 hunting back and forth.

What I claim is:

In a governor for an internal combustion engine oi the type in which the suction in the venturi in the air entrance to the engine is utilized to control the maximum speed by closing a throttle valve located in the air entrance on the engine side of the venturi, means for utilizing the suction on the engine side of the throttle v to augment the suction in the venturi comprising a chamber, a movable wall in said chamber, said chamber communicating with the engine suction, a valve carried by the moving wall, a passage connecting the engine suction with the throat of the venturi, a valve therein, said valve being connected to the moving wall, a spring engaging in the moving wall so as to close said valve, a movable cam adapted to be moved by said throttle, said cam being also adapted to engage with said spring to vary the pressure on said movable wall, whereby the engine suction which unseats the valve has a specic value at every specific position of the throttle valve.

9 STANLEY M. UDALE. 

